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Keep screen awake during conversion #17

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Keep screen awake during conversion #17

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31 changes: 31 additions & 0 deletions public/demo.html
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Original file line number Diff line number Diff line change
Expand Up @@ -184,6 +184,8 @@ <h2 class="visually-hidden">About</h2>
let sourceBase = 'document';
let currentUserCode = null;
let currentBlobUrl = null;
let conversionWakeLock = null;
let conversionActive = false;

const $ = (id) => document.getElementById(id);
const show = (id) => { $(id).hidden = false; };
Expand Down Expand Up @@ -226,6 +228,29 @@ <h2 class="visually-hidden">About</h2>
try { const j = await res.json(); return (j.error && j.error.message) || res.statusText; }
catch { return res.statusText; }
}
async function acquireConversionWakeLock() {
if (!('wakeLock' in navigator) || document.visibilityState !== 'visible' || conversionWakeLock) return;
try {
conversionWakeLock = await navigator.wakeLock.request('screen');
conversionWakeLock.addEventListener('release', () => { conversionWakeLock = null; });
} catch {
// Wake Lock is best-effort: unsupported browsers or denied requests should not block conversion.
}
}
async function startConversionWakeLock() {
conversionActive = true;
await acquireConversionWakeLock();
}
async function stopConversionWakeLock() {
conversionActive = false;
if (!conversionWakeLock) return;
const lock = conversionWakeLock;
conversionWakeLock = null;
try { await lock.release(); } catch {}
}
document.addEventListener('visibilitychange', () => {
if (conversionActive && document.visibilityState === 'visible') void acquireConversionWakeLock();
});

// ----- Step 1: GitHub device flow -----
$('signin-btn').addEventListener('click', startDeviceFlow);
Expand Down Expand Up @@ -312,6 +337,7 @@ <h2 class="visually-hidden">About</h2>
setError('');
const files = $('images').files;
if (!files.length) { setError('Please choose at least one image.'); return; }
await startConversionWakeLock();
// Output download name mirrors the uploaded file.
sourceBase = (files[0].name.replace(/\.[^.]+$/, '').replace(/[^A-Za-z0-9._-]/g, '_')) || 'document';
const fd = new FormData();
Expand All @@ -329,6 +355,7 @@ <h2 class="visually-hidden">About</h2>
announce('Starting… ' + d.image_count + ' page(s) uploaded.');
pollStatus();
} catch (e) {
await stopConversionWakeLock();
setError('Upload failed: ' + e.message);
} finally {
btn.removeAttribute('aria-busy');
Expand All @@ -353,6 +380,7 @@ <h2 class="visually-hidden">About</h2>

if (d && d.status === 'ready_for_review') {
announce('Done! Your accessible HTML is ready.');
await stopConversionWakeLock();
try {
await showResult(d);
} catch (e) {
Expand All @@ -361,6 +389,7 @@ <h2 class="visually-hidden">About</h2>
return; // terminal — stop polling
}
if (d && d.status === 'failed') {
await stopConversionWakeLock();
setError('Conversion failed: ' + (d.error || 'unknown error') + '. You can try again.');
hide('status-section'); show('upload-section'); focusHeading('step2-h');
return; // terminal — stop polling
Expand Down Expand Up @@ -412,6 +441,7 @@ <h2 class="visually-hidden">About</h2>
setError('');
const fb = $('feedback-text').value.trim();
if (!fb) { setError('Please enter some feedback first.'); return; }
await startConversionWakeLock();
try {
const res = await api('/sessions/' + sessionId + '/feedback', {
method: 'POST', headers: { 'content-type': 'application/json' },
Expand All @@ -423,6 +453,7 @@ <h2 class="visually-hidden">About</h2>
announce('Re-running with your feedback…');
pollStatus();
} catch (e) {
await stopConversionWakeLock();
setError('Could not submit feedback: ' + e.message);
}
});
Expand Down